Rascal is a sea urchin and lives in the sea. One day he climbs aboard the yacht that is moored to the buoy above his home. The buoy is his good friend Eva - three tons only - who is round, comforting and on top of her world. He is amazed at all that is around him and excitedly offers to sail as part of the crew. For this, he has to learn to be a boy; luckily he already looks like one even though his face is rather green. We follow his adventures in our world as he learns to sail with 'Skipper' and live like one of us. He joins in with all he meets as they make their way 'round the Mull of Kintyre and up north to the Isle of Skye. This new world is endlessly changing; it challenges and thrills him. By the way, please understand, Eva does not weigh three tons, it is just that she is so strong she can hold on to that much!